Photo Information

Photograph by C. Heliker on September 8,
1992

Geophysicists make measurements across the roof of
a lava tube leading from the episode 51 vents. The measurements reveal
the size of the tube and the cross-sectional area of the lava stream.
Together with measurements of the speed of the lava stream, these data
allow us to estimate lava discharge from the volcano.

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Updated: 18 May 2000